Roughening tool for the working of leather



E. SACHSE ET AL ROUGHENING TOOL FOR THE WORKING OF LEATHER Filed March 28, 1929 Jnven fors: Ermhathse www Patented Aug. 11, 1931 UNITED STATES ERICH SACHSE, OF PEGAU, AND OTTO MICHALK, F FREITAL,.GERMA.NY

ROUGHENING TOOL FOR THE WORKING OF LEATHER Applicationled March 28, 1929, Serial No. 350,520, and in Germany May-5, 1928.

In the manufacture of boots and shoes by glueing the parts together it is necessary to roughen the leather pieces at the glue'- ing rims prior to applying the agglutinant or cementing medium in order to cause the pieces or parts to stick more strongly toether. The roughening is generally efected by means of rotating disks bearing spikes or similar members,`for instance such 1o as used in connection with carding bands. The leather parts must be roughened only at their surface, as it can otherwise easily occur that pieces are torn out of them whereby the parts will be severely impaired. The

degree of the roughening could be determined up to now, i. e. with the roughening tools employed up to now, chiefly only at random by pressing the leather more or less strongly against the respective tool, so that the roughening operation must be ei'ected by clever workmen, especially if the leather is thin, but even particularly clever work-v men are only seldom in the position todeliver a satisfying output. A

The object of the present invention is to obviate the above-mentioned drawbacks, and the ob'ctsought to be attained is obtained by ma 'ng the eective length of the roughening spikes or their equivalents adjustable 3o or readjustable for instance by holding them between lamellae over ,which only a small piece of every spike, etc. .pro'ects The length of the projecting pieces o the spikes, etc. can be determined by shifting either these members in the lamellae or these latter upon the spikes etc., according to the sort or quality etc. of the leather. As the lamellae present a rigid surface for the leather parts the roughening work is consider- 40, ably facilitated, in that the respective parts can be pressed down upon, and stretched over, whereby the spikes etc. are prevented from tearing pieces of the leather out of the leather parts treated.

In the vcase of the employment of carding bands the roughening device may\ be so designed' that said bands can be easily exchanged, for which purpose they are supported upon sector-shaped members andare retained upon them by springs. There may band e probe eyes at the ends of the Cardin pieces, and a common spring may vided for a plurality thereof.

The invention is illustrated diagrammatically and by way of example on the accompanying drawings on which c Figure l is a plane of a roughening tool designed according to this invention,

Figure 2 is a longitudinal section therethrough;

Figure 3 shows some details, drawn to an enlarged scale;

Figure 4 is a side-view of another constructional form of the tool;

Figure 5 is a transverse section in the 6. plane 5 5 of Figure 6, the cover (z', Fig. 6) being removed, and

'Figure 6 is an axial section through the same modification in the plane 6-6 of Figure 5.

Thebody of the roughening tool, or of the carding band carrier respectively, consists of a disk a (Fig. 2) having on its two sides hubs 0, and a, each hub having a bore. The diameter of the bore of the hub a is larger than the diameter of the bore of the hub a, and the opposite portions of the two bores are connected with one another by a conical bore into which terminate two oppositely located radial bores, each of which 80 encloses a plunger b connected at its outer end with a circularl curved segment b contacting with one o the lateral surfaces of the disk a. The two segments b b are drawn towards one another by helical springs 0, as shown in Figs. l and 2, and each is provided on its outer circumferential face with agroove into which is placed a piece of carding band e, the ends of which are afliXed to the respective segmentby screws m.

The spikes e of the carding band form rows, as usual, and between these rows are lamellae h (Fig. 3) shaped in conformity with the shape of the spaces between said rows of spikes. The lamellae pertaining to a segment b are connected with one another at one end by a bolt 71, common to them, and at the opposite ends they are hinged at 71. to the disk a so that they can e swung outwardly on these bolts k".

a (Fig. 2) denotes a shaft having a conical portion n, the shape of which corresponds to that of the conical bore portion above-mentioned. The device is shoved upon said shaft, as shown in Fig. 2, and secured thereto by nuts p. The plungers b are pressed outwardly by the conical shaft portion in whereby also the segments Z) with the carding band portions are moved outwardly, counter to the pull of the springs c, in consequence whereof the pointed ends e' of the spikes project more or less over the lamellae 7L. How much the ends e projdepends upon how far the device has been shoved upon the shaft, and this can be determined by the position of an adjustable abutment nut o and the end nuts p.

How much the spike ends can be permitted to project depends upon the kind or quality of the leather to be treated. The tension of the springs c must be such that the segments b are not moved radially outwards by the centrifugal force when the device is rotating so that the spike ends e cannot project more than intended, and is proper for the respective leather, which finds' an abutment or support upon the lamellae and into which the spike ends can penetrate only so much as they project over the lamellae whereby a detrimental action upon the leather by too strong roughening is very securely prevented. Owing to this manner of operation of the device unskilled hands can be employed for roughening even delicate kinds of leather, and as no particular care is needed inthe manipulation of the device the work proceeds quickly and the output is considerably greater than heretofore.

Roughening devices operatingr with carding bands require frequent renewal of the latter. Although the roughening work can be done by young hands, the renewal of the carding bands necessitates a certain skill, and it is, therefore, necessary, that it be carried out by skilled persons. As the endless working band has been introduced also in the manufacture of boots and shoes it is very disturbing if the renewal of the carding band requires an unduly long period of time, and it may be that the endless working band must be stopped which is highly undesired. On the other hand, the carding band must be securely attached to, and properly stretched upon, its support and remain in this state while the roughening device is operating, the very important point to be observed being this that the number of revolutions of the device is about 2000 per minute, in consequence whereof the centrifugal force tends to throw the band outwardly and to lengthen it.

Although already the constructional form shown in Figs. 1 8 answers all practical requirements, a still more improved constructional form intended especially for use in connection with a running band is shown in Figs. 4 6. This constructional form is so designed that the carding band pieces can be renewed quickly and reliably also by unskilled hands.

The body a3 is provided with a sleeve a* means of which the device can be attached to a shaft. b2 are the sector-shaped members'which are housed in the body a3 and are firmly connected with the radial plungers b3, the inner ends of which are oblique, as shownin Fig. 6, and can be moved away from one another by the conical inner end of an adjustingV screw k having a head k with knurled circumference. This screw k can be fixed in its adjusted position by a nut Z. When the screw lo is-turned in clockwise direction the plungers and the sectors are moved outwardly, and helical springs c connecting the sectors with one another and tending to draw them towards one another are put under increased tension.

The two carding bands e are stretched over the sectors b2, and eyes f provided at one end of each of said bands are connected with one another by another helical spring g by which the two bands e are firmly pressed upon the said sectors. Eyes f are provided also at the other ends of the carding bands, and hooks d are provided at the correspondingly located ends of the sectors b2. Attaching the carding bands to the sectors is effected by insertin the ends of the spring g into the eyes f', s oving the eyes f upon the hooks oZ, and then shoving the bands from the side of the nut Z upon the sectors, it being understood that prior thereto the vmembers and Z, as well as the cover z', have. been removed. Then the cover is putin place.

Itis provided with two diametrically oppositely located pins engaging bores h provided in the lamellae and is secured in'its proper position by the nut Z after the screw 7c has been re-inserted into the body a3.

` The operation of the carding bands is best when they do not lie perpendicularly with respect to the axis of the device or tool, but somewhat obliquelv thereto. Thereby the entire leather surface contacting with the ends of the spikes is uniformly roughened, as the spikes over the whole breadth of the roughening surface will operate upon the leather without moving the leather laterally. A suitable oblique position of the bands can be attained by disposing the opposed faces of parts as, z' at oblique angles to the axis of the tool, as shown by lines m-w and yL-fy in Fig. 4, and also by positioning the pins of the carding bands-so that they have a staggered arrangement over the working face of the tool, as will be readily understood. The-carding bands then operate at an angle to the tool and give a better abrading effect. After the pins and lamellae are adjusted the nut l is tightened to cause disk i to tightly clamp the same in adjusted position.

We claim:

` l. A roughening tool for the working of leather, comprising a rotatable support, rows of radially adjustable roughening spikes, means for holding them in operative position on said support, lamellee positioned between said rows of spikes, and means for adjusting the spikes to vary the effective length of said spikes.

2. A roughening tool for the working of leather, comprising, in combination, a diskshaped rotary body, circularly curved members so arranged as to be adapted to be shifted radially alongy said body or disk, springs so arranged as to tend to draw said curved members towards one another, means by which the said members can be moved away from one another, roughening spikes, and means holding them in operative position, these means being attached to, and supported by the said curved members.

3. A roughening tool for the worlng of leather, comprising, in combination, a diskshaped rotary body, circularly curved members so arranged as to be adapted to be shifted radially along said body or disk, plungers guided in the said body and having said curved members ahxed to their outer ends, means by which the said members can be moved away from one another, roughening spikes, and means holding them in operative position, these means being attached to, and

supported by the said curved members.

4. A roughening tool for the working of leather, comprising, in combination, a diskshaped rotatory body, circularly -curved members so arranged as to be adapted to be shifted radially along said body or disk, springs so arranged as to tend to draw said curved members towards one another, means by which the said members can be moved away from one another, carding band pieces bearing roughening spikes and being attached to, and supported by said curved members, and a spring maintaining said band pieces in proper position upon the said curved members and keeping them under tension.

. 5. A roughening tool for the working of leather, comprising, in combination, a diskshaped rotatory body, circularly curved members so arranged as to be adapted to be shifted radially along said body or disk, springs so arranged as to tend to draw said curved members towards one another, means by which the said members can be moved away from one another, carding band pieces bearing roughening spikes and being attached to and supported by said curved members, eyes at the ends of said band pieces, a hook provided at one end of each of said curved members and engaging the eye at one end of each band piece, and a spring connected at both ends with the other eyes of the carding band pieces and maintaining these latter in proper position upon the said curved members and keeping them under tension.

6. A rougheningr tool for the Working of leather, comprising, in combination, with rows of roughening spikes, and with means for holding them in operative position, lamellee arranged between said rows in an oblique position with respect to the driving axis of the tool, and means for adjusting the active length of said spikes with respect to said lamellee.

7. A roughening tool for the working of leather, comprising, in combination, a rotatory tool body, a cover-like member arranged co-axially with said body, carding band pieces and supporting members for them, these pieces and members being arranged between said body and said cover, lamellee located between the spike rows of said band pieces and being, together with them, arranged in an oblique position with respect to the tool axis, the faces of the said body and the said cover opposite said ca rding band pieces having the same Obliquity as said lamellee.

8. A roughening tool for the working of leather, comprising a rotative support, rows' of radially adjustable spikes arranged at an oblique angle to the axis of the tool, means for holding the spikes in operative position on 'said support, lamellee positioned between said rows of spikes, and means for adjusting the spikes to vary the effective length thereof.

In testimony whereof we affix our signatures.

ERICH SACI-ISE. OTTO MICHALK. 

